Here is the latest installment in Fox's "Noble Intentions" series.
John Noble discusses the "Happy Birthday" scene in episode 416, and his impressions on Walter Bishop in Season 4, in what has to be one of the best "Noble Intentions" done to date.

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Comments:

I enjoyed that. It did the sort of thing DVD commentaries so often fail to do - it explained what was going on in the head of the character and the actor playing the character, as well as talking about themes and meanings in the series as a whole. Commentaries are so often dire - like the absolutely crass commentary to Crouching Tiger, Hidden Dragon. They tend to be just chums and colleagues chatting among themselves about trivialities or technicalities, and exclaiming: "Oh, that must have hurt" when a carefully staged impalement or something appears. People don't open up about what they wanted to achieve with the story as a whole (beyond a merely visual spectacle or special effect) and whether they got what they aimed for or not - and where they went from there. The how dominates over the why to a depressing extent.